diff --git a/routes/auth_routes.py b/routes/auth_routes.py
index 1042437ac..378f22afa 100644
--- a/routes/auth_routes.py
+++ b/routes/auth_routes.py
@@ -887,6 +887,8 @@ def setup_auth_routes(auth_manager: AuthManager) -> APIRouter:
         """Create a new integration (admin only)."""
         _require_admin_user(request)
         body = await request.json()
+        if not isinstance(body, dict):
+            raise HTTPException(400, "Request body must be a JSON object")
         item = add_integration(body)
         return {"ok": True, "integration": mask_integration_secret(item)}
 
@@ -895,6 +897,8 @@ def setup_auth_routes(auth_manager: AuthManager) -> APIRouter:
         """Update an existing integration (admin only)."""
         _require_admin_user(request)
         body = await request.json()
+        if not isinstance(body, dict):
+            raise HTTPException(400, "Request body must be a JSON object")
         item = update_integration(integration_id, body)
         if not item:
             raise HTTPException(404, "Integration not found")
diff --git a/routes/document/document_routes.py b/routes/document/document_routes.py
index 2b987e140..2a820de75 100644
--- a/routes/document/document_routes.py
+++ b/routes/document/document_routes.py
@@ -781,9 +781,11 @@ def setup_document_routes(session_manager, upload_handler=None) -> APIRouter:
         except Exception as e:
             logger.warning("Failed to parse export request body, defaulting to empty", exc_info=e)
             data = {}
-        ids = data.get("ids") or []
+        ids = data.get("ids") if isinstance(data, dict) else None
         if not ids:
             raise HTTPException(400, "No documents specified")
+        if not isinstance(ids, list) or not all(isinstance(i, str) for i in ids):
+            raise HTTPException(400, "ids must be a list of document ids")
         _ext = {
             "javascript": ".js", "python": ".py", "html": ".html", "css": ".css",
             "markdown": ".md", "json": ".json", "yaml": ".yml", "bash": ".sh",
diff --git a/tests/test_document_export_zip_ids.py b/tests/test_document_export_zip_ids.py
new file mode 100644
index 000000000..3a2510d1c
--- /dev/null
+++ b/tests/test_document_export_zip_ids.py
@@ -0,0 +1,47 @@
+"""POST /api/documents/export-zip answers 400 for ids that are not a list of document ids."""
+
+import json
+from types import SimpleNamespace
+from unittest.mock import MagicMock
+
+import pytest
+from fastapi import HTTPException
+
+from tests.helpers.import_state import clear_fake_database_modules
+
+clear_fake_database_modules()
+
+import routes.document_routes as droutes
+
+
+class _Req:
+    def __init__(self, body):
+        self.state = SimpleNamespace(current_user="tester")
+        self._body = body
+
+    async def json(self):
+        return self._body
+
+
+def _export_zip():
+    router = droutes.setup_document_routes(MagicMock(), None)
+    for r in router.routes:
+        if getattr(r, "path", None) == "/api/documents/export-zip":
+            return r.endpoint
+    raise RuntimeError("export-zip route not found")
+
+
+@pytest.mark.parametrize("body", [[], "x", 5, {}, {"ids": []}, {"ids": None}])
+async def test_missing_ids_is_a_400(body):
+    with pytest.raises(HTTPException) as exc:
+        await _export_zip()(_Req(body))
+    assert exc.value.status_code == 400
+    assert exc.value.detail == "No documents specified"
+
+
+@pytest.mark.parametrize("ids", [5, "abc", {"a": 1}, [1, 2], [["a"]], ["a", None]])
+async def test_ids_that_are_not_a_list_of_strings_is_a_400(ids):
+    with pytest.raises(HTTPException) as exc:
+        await _export_zip()(_Req({"ids": ids}))
+    assert exc.value.status_code == 400
+    assert exc.value.detail == "ids must be a list of document ids"
diff --git a/tests/test_integrations_store_shape.py b/tests/test_integrations_store_shape.py
index c97f71b5e..c93e5324d 100644
--- a/tests/test_integrations_store_shape.py
+++ b/tests/test_integrations_store_shape.py
@@ -177,3 +177,28 @@ def test_update_integration_rejects_invalid_base_url_without_changing_existing(
     assert exc.value.status_code == 400
     assert exc.value.detail == message
     assert integrations.load_integrations()[0]["base_url"] == "https://example.test"
+
+
+@pytest.mark.parametrize("body", [[], "x", 5, None])
+def test_create_integration_rejects_non_object_body(integrations_routes, body):
+    endpoint, session_cookie, http_exception = integrations_routes
+    create_integration = endpoint("/api/auth/integrations", "POST")
+
+    with pytest.raises(http_exception) as exc:
+        asyncio.run(create_integration(_JsonRequest(body, session_cookie)))
+
+    assert exc.value.status_code == 400
+    assert integrations.load_integrations() == []
+
+
+@pytest.mark.parametrize("body", [[], "x", 5, None])
+def test_update_integration_rejects_non_object_body(integrations_routes, body):
+    endpoint, session_cookie, http_exception = integrations_routes
+    update_integration = endpoint("/api/auth/integrations/{integration_id}", "PUT")
+    integrations.save_integrations([{"id": "existing", "name": "Original", "base_url": "https://example.test"}])
+
+    with pytest.raises(http_exception) as exc:
+        asyncio.run(update_integration("existing", _JsonRequest(body, session_cookie)))
+
+    assert exc.value.status_code == 400
+    assert integrations.load_integrations()[0]["name"] == "Original"